单项选择题
A.OSPF router 5.0.0.2 is an ABR
B.Network 6.0.0.0/8 was learned from an OSPF neighbor within the area
C.The default route is learned from an OSPF neighbor
D.A default route is configured on the local router
单项选择题 From the perspective of routerPG-1，what kind of router is the router with IP address 192.23.1.1（）
多项选择题 WhiletroubleshootingaroutingproblemonthecompanyEIGRPnetworkyoudiscoverthatoneoftheroutersisfailingtoestablishadjacencieswithitsneighbor.Whatisalikelycauseofthisproblembetweenneighbors？（）
单项选择题 EIGRPusesfivegenericpackettypes（hello，updates，queries，replies，acknowledgements）.Ifyouwishedtoviewthestatisticsforthesepackets，whichIOScommandshouldyouuse？（）
